Acesion Pharma ApS is a Danish biotech company founded in 2011 and based in Copenhagen. Acesion Pharma develops more efficacious and safe drugs for the treatment of atrial fibrillation (AF), the most common type of cardiac arrhythmia. Existing drug therapies generally have a limited effect or are associated with risk of serious adverse events, and there is therefore a considerable patient need for developing better and safer drugs. Inhibition of SK channels, an ion channel with relevance for regulating the heart rhythm, constitute a new and promising principle for the treatment of AF. Acesion Pharma aims to develop first-in-class SK channel inhibitors as a more efficacious and safe treatment of AF.